const formatTime = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  const second = date.getSeconds()

  return [year, month, day].map(formatNumber).join('/') + ' ' + [hour, minute, second].map(formatNumber).join(':')
}

const formatOnlyTime = date => {
  // const year = date.getFullYear()
  // const month = date.getMonth() + 1
  // const day = date.getDate()
  const hour = date.getHours()
  const minute = date.getMinutes()
  // const second = date.getSeconds()

  return  [hour, minute].map(formatNumber).join(':')
}

const formatDate = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1
  const day = date.getDate()

  return [year, month, day].map(formatNumber).join('-')
}

const formatYearMonth = date => {
  const year = date.getFullYear()
  const month = date.getMonth() + 1

  return year + "年" + month + "月"
  // return [year, month].map(formatNumber).join('-')
}


const formatYear = date => {
  const year = date.getFullYear()

  return year + "年"
}



const formatNumber = n => {
  n = n.toString()
  return n[1] ? n : '0' + n
}

module.exports = {
  formatTime: formatTime,
  formatDate: formatDate,
  formatYearMonth: formatYearMonth,
  formatYear: formatYear,
  formatOnlyTime: formatOnlyTime
}